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在石油或地质钻井现场,常常要对折断的钻杆进行手工电弧焊接。一般来说,要完成这项工作,困难较多。其中较难解决的是焊接时的磁偏吹现象。这种磁偏吹往往是因生产厂采用强力电磁铁起吊工序或漏磁探伤的检验工序时残存下来的剩磁而引起的。这些剩磁,有时使焊口两侧的磁场极性相同,产生同性相斥现象,造成熔滴四溅而不能进入熔池的磁偏吹(图1);有时虽使焊口两侧的磁场极性相异,但两侧的磁场强度差异较大,造成熔滴偏向一侧的磁偏吹。
In the oil or geological drilling site, often to the broken drill pipe manual arc welding. In general, it is more difficult to complete this task. One of the more difficult to solve is the phenomenon of partial magnetic bias blowing welding. This partial magnetic blow is often caused by the remnants of magnetism left by the manufacturing plant when using a strong electromagnet lifting procedure or flux leakage testing procedure. These remanent magnets, sometimes make both sides of the weld magnetic field polarity the same, resulting in the phenomenon of same-sex repulsion, causing the droplet splashing can not enter the pool of magnetic partial blow (Figure 1); sometimes although both sides of the weld magnetic field Different polarities, but the magnetic field strength on both sides of the larger differences, resulting in one side of the droplet bias partial magnetic blow.